Truing tools for a grinding wheel



Nov. 24, 1959 l. v. ABADJIEFF TRUING TOOLS FORA GRINDING WHEEL Original Filed July 18, 1957 3 sheet n l m Al+|l|i|v fiw E N M/ M ED T V T vl N m M ma 6 v 0 2 4 w. 2 2 2 .m Mu m Nov. 24, 1959 l. v. ABADJIEFF TRUING TOOLS FOR A GRINDING WHEEL Original Filed. July 18, 1957 3 Sheets-Sheet 2 'FIGZ R 0 T. N E V N IVANVABADJIEFF M 9 ATTORNEY Nov. 24, 1959 1. v. AB'ADJIEFF TRUING TOOLS FOR A GRINDING WHEEL Original Filed July 18, 1957 3 Sheets-Sheet 3 INVENTOR IVAN V. ABADJIE FF ATTORNEY United States Patent Divided and this application; May 8, 19. r

T,hisapplication, is agdivision of my, prior. application Serial=-.No., 672,837, filed Luly, 18,1957.

This invention relates to a new and improved,appara:v t-us for: quickly; easily andn accuratclyvsharpening drills, andv the principals. object, of the; invention: includes: the provision: oft. abase, a: motor, and, a,,flat;= abrasive, wheel drivenably the motor andmounted on ;the;base, fionsharpening and pointing the drill, together. with the. provision; of news and usefulzwheel dressing} devicespfor; dressing the face oflthewheel andithewperipheraledgethereof include ing a: pair of: diamond points; onebeing mounted on-an arm pivoted. on an axis parallel'to'the axisrof thewheel, in combination with another arm: for the-other diamond point mounted on an axis at right angles theretosior dress= ing thetedg e of the wheel; in combination with" means for adjusting and gauging the tips: of the' diamond points to bring the same into alignment with the proper plane with respect to the axis of the machine for quick and easy adjustment oF-the diamond points to the: end that the wheel may be quickly and easily dressed accurately, whereby the drill='=ma -y be sharpenedmore accurately.

Other objects and advantages of'the invention will appear hereinafter.

Reference is tobe had to the accompanying drawings, in which Fig. 1 is.a plan view illustrating the invention. andthe relationship of the diamond points to the cutting wheel;

Fig. 2 is a view in front elevation, looking along the arrow 2 in Fig. 1;

Fig. 3 is asection on line.3-3 of Fig. 1;

Fig. 4 is a diagrammatic view illustrating the action of the gauge and looking in the direction generally of arrow 4 in Fig. 2; and

Fig. 5 is a view in side elevation with parts omitted for clarity of illustration.

In carrying out the present invention, attention is first directed to Figs. 1 and 2 wherein there is shown a machine base generally indicated at 10. This base is preferably raised by means of a surrounding flange 12 or the like which is adapted to be set upon a bench or table and upon which the drill sharpener and point thinner is mounted.

A motor 14 is mounted on a standard 16, the latter being oscillatably mounted on the base preferably Within the same and as shown standard 16 may be conveniently mounted horizontally on opposite portions of the flanges 12. A handle 18 is provided on the standard for oscillating the motor in order to carry out the sharpening action for the drill as will become more apparent hereinafter.

Standard 16 is mounted to oscillate on a bearing member or sleeve 20 and the standard 16 has a cylindrical portion 21 surrounding this bearing or sleeve 20 as clearly shown in Fig. 3, said cylindrical portion being oscillatably supported in a boss or the like 22 formed on a flange 12.

The cylindrical portion of the standard 16 is provided with an upstanding projection 24 formed by indentations 2,914,057 PatenteiNov. 24, 1959 ateither side thereof, andthisis adapted toabutthein-. ner end of ang-adjustablestop. member 26 adjustably lice mounted in and-out by a screw: 28, rnanipulated by a thumbpiece 3lhas clearlyshown in Fig; 3. When the standard-16 and; motor 14 are moved as for instance to the dottedliner'positionin; Fig. 3,' the stop projection 24 engages aslidable member 32 ;located oppositely the stop member 26 andb'y thisrmeans. tends to compress'a spring 34 mounted 'on' a rod:3,6.-, This-,rodis slidable with respect to an adjustable.threaded member 38; adjusted bya rnember 40 for the purpose of providingiorvariable tension on spring 34'. Thus themotorwilhalwaysbe moved back to its upright position by spring34-when moved from solid line position in-Fig43 to dottedrline. position therein; andthe'standard I6 alsohasa motionpin theopposite direction to thedot-and-d'ash line position wherein it is stopped by member 26 whicli may be adjusted to vary the position of limit of travel of-standard 16in this direction:

The motor 14 isprovided with a fiat or cup face abrasive Wheel 42 which in this case is directly mounted onthe' shaft. This wheel moves-with the'motor in the oscillatory motion thereof during-the sharpening operation for the drill.

The entire motor and wheel assembly is movable axially of the motor-by proper manipulation of a threaded shaft 44 (Fig. 4) 'manipulatedfrom the frontof the machine by a hand wheel 46 which is secured to an extending end thereof as clearly shown'in Fig. 4:

The. threaded shaft" 44 is threadedly engaged with an internally-threaded "hollow portion in thebearing. or sleeve 20 as indicated at 48,,andthe bearingor sleeve 20 is held against rotation by means of'a k'ey 501slidably engaged in a slot, 52 in sleeve 20, the key being spring-pressed into engagement therewith, as by a spring 54 located in a cavity, 56 .inthe top member of the table 10.

As the handwheel 46. is: rotated, the sleeve 20 will be appropriately. movedlongitudinally, carrying with it standard.16,. motor 14 andtheabrasive; wheel 42,for the purpose. of adjusting the. depthof cut to be taken from the drill in order to properly sharpen the same, the motor and wheel 42 moving axially.

Mounted on the top of the table 10, there is provided a standard 58 swivelly mounted on a vertical axis as for instance by a vertical pin 60 or the like in the base 10. A locking screw 62 may be provided to engage the pin 60 to hold the standard with reference to a zero indicating mark 64, see Fig. 1. The angle of the standard is angularly re-positioned with respect to the plane of the abrasive wheel 42 to vary the angle of the point of the drill.

On the standard there is a rockable arm which may be actuated by a handle 70 and on this arm there is a receiver which receives a drill holder chuck 82. The drill in chuck 82 is observable by means of a magnifying lens in an eye-piece 84 mounted on an arm 114 which is held by a not or the like 112 on a mount adjustably located in a ferrule 102 also mounted on the standard 58.

As explained in the parent application, the drill point is accurately observed through the lens in order to rotationally position the same prior to the angular actuation of the arm to sharpen the drill by actuating the arm to move receiver 80 and chuck 82 in a direction to engage the wheel 42.

The chuck 82 may be re-positioned in another receiver at for a point-thinning operation against the periphery of wheel 42, and again a lens in an eye-piece 86 mounted on a mount 88 may be utilized to observe the angular position of the drill in the chuck 82. The mount 88 is adapted to be located on an arm 186 which in turn may be manipulated by handle 182, see Fig. l to carry out this operation.

The above operations of sharpening and thinning a drill point are fully explained in the parent application and the invention in this particular case relates to the means for dressing the flat face of wheel 42 and the peripheral edge thereof so that the operations may always be carried out as exactly and accurately as possible.

At the forward portion of the machine, there is provided a pivoted arm 150 which is mounted on an axis parallel to the axis of wheel 42 as by means of a stud or the like 151. As shown in Fig. 1, this arm carries at its upper end a diamond-point 152 which is mounted on a threaded rod 153. The threaded rod is provided with a thumb-screw 155 for adjustment of the diamondpoint 152 in an axial direction, parallel to the axis of the motor and wheel 42.

At the side of the base 10, there is mounted a pivoted arm 154 which is pivotable upon an axis at right angles to the motor and wheel axis and also at right angles to the axis of pivoted arm 150. Arm 154 may be mounted on any kind of pivot, and in this case this is shown as provided by a removable pin 157.

At its upper end, arm 154 is provided with a diamondpoint 156 which is adjustably mounted by means of a pin 159 having a lock-nut 161 and mounted on an extension 163 which may be used as a handle to move the arm 154 together with diamond-point 156 in a direction to engage the peripheral edge of wheel 42 in order to dress the same as will be clear to those skilled in the art.

Arm 154 is also provided with a gauge stop 232. This gauge stop comprises a button which aligns with the diamond-point 152, see Fig. 5, and forms a stop to which to adjust the point 152 by the hand-wheel 155 so as to accurately align the diamond-point, even when worn, to dress the flat face of the wheel 42.

Arm 154 is stopped in its motion toward arm 150 by means of a stop pin 236 mounted on the flange 12 in proper gauging position thereof. Thus with the and 154 in its gauging position (see Fig. the diamond-point 152 may be properly manipulated in order to bring it into correct alignment with the fiat forward face of the wheel 42 so that when the arm 150 is oscillated back and forth and the wheel 42 is rotating, the flat front face of the wheel may be accurately dressed off.

The wheel 42 is brought into proper dressing position relative to the point 156 simply by manipulating the Fig. 3 may be turned in order to properly position the edge of the wheel 42 exactly where desired with relation to the adjustment which is made possible by the screwthreaded pin 159 and lock nuts 161.

Having thus described my. invention and the advantages thereof, I do not wish to be limited to the details herein disclosed, otherwise than asset forth in the claims, but whatI claim is: v

1. A grinding machine compri singa base, a motor on the base, an abrading wheel on the motor, and a pair of truing tools, each said tool comprising a movable arm and a diamond-point, and means mounting the arms on the base for movement in directions at right angles -to each other, one arm being movable parallel to the face of the wheel and the other arm being movable axially thereof, means to limit the motion of the said other arm in a predetermined position, a gauge on the said other arm, and means to adjust the point on the-one arm-to said gauge in said predetermined position of the said other arm. 1 1

2. A grinding machine comprising a base, a motor on the base, an abrading wheel on themotor, and a truing tool, said tool'comprising a-movable arm and a diamondpoint thereon, means mounting the arm on the base for movement in a direction at right angles to the axis of the wheel, the arm being movable parallel to the face of the wheel, and another arm movable axially thereof,

means to stop the motion of the second arm in a predetermined position, a gauge on the second. arm, and means to adjust the point on the first arm'to said gauge in stopped position of the second arm.

' 3. The grinding machine of claim 2 including a second diamond-point on the second arm in position to true the edge of the wheel.

4. The grinding machine of claim 2 including a second diamond-point on the second arm in position to true the edge of the wheel, and means to adjust the second diamond-point in a direction at right angles to the adjustment of the first-named diamond-point.

References Cited in the file of this patent UNITED STATES PATENTS 2,199,773 Armand May 7, 1940 

